Data transmission device



FIG. 1 is a top plan view of a data transmission device;

FIG. 2 is a right side elevation view of a data transmission device;

FIG. 3 is a rear elevation view of a data transmission device;

FIG. 4 is a left side elevation view of a data transmission device;

FIG. 5 is a front elevation view of a data transmission device;

FIG. 6 is a perspective view of a data transmission device; and,

FIG. 7 is a second perspective view of a data transmission device.

The bottom of a data transmission device, not shown, forms no part of the claimed design.

Broken line areas show portions of the data transmission device which form no part of the claimed design. 

CLAIM I claim the ornamental design for a data transmission device, as shown and described. 